 /*******************************************************************************
  * Copyright (c) 2003, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM - Initial API and implementation
  *******************************************************************************/
 package org.eclipse.core.internal.resources;

 import org.eclipse.core.internal.utils.Policy;
 import org.eclipse.core.resources.ResourcesPlugin;
 import org.eclipse.core.runtime.*;
 import org.eclipse.core.runtime.jobs.Job;

 /**
  * Batches the activity of a job as a single operation, without obtaining the workspace
  * lock.
  */
 public abstract class InternalWorkspaceJob extends Job {
     private Workspace workspace;

     public InternalWorkspaceJob(String name) {
         super(name);
         this.workspace = (Workspace) ResourcesPlugin.getWorkspace();
     }

     public final IStatus run(IProgressMonitor monitor) {
         monitor = Policy.monitorFor(monitor);
         try {
             int depth = -1;
             try {
                 workspace.prepareOperation(null, monitor);
                 workspace.beginOperation(true);
                 depth = workspace.getWorkManager().beginUnprotected();
                 return runInWorkspace(monitor);
             } catch (OperationCanceledException e) {
                 workspace.getWorkManager().operationCanceled();
                 return Status.CANCEL_STATUS;
             } finally {
                 if (depth >= 0)
                     workspace.getWorkManager().endUnprotected(depth);
                 workspace.endOperation(null, false, monitor);
             }
         } catch (CoreException e) {
             return e.getStatus();
         }
     }

     protected abstract IStatus runInWorkspace(IProgressMonitor monitor) throws CoreException;
 }

